Strong mag. 5.4 earthquake - 123 km west of Hirosaki, Aomori, Japan, on Monday, June 20, 1983 at 02:43 GMT
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Strong magnitude 5.4 earthquake at 18 km depth
1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Earthquake details
| Date & time | Jun 20, 1983 02:43:24 UTC |
| Local time at epicenter | |
| Status | Confirmed |
| Magnitude | 5.4 |
| Depth | 18.3 km |
| Epicenter latitude / longitude | 41.004°N / 139.12°E  (Japan Sea, Japan) |
| Antipode | 41.004°S / 40.88°W |
| Shaking intensity | Moderate shaking near epicenter |
| Felt | 0 reports |
| Primary data source | USGS (United States Geological Survey) |
| Nearest volcano | Oshima-Oshima (60 km / 37 mi) |
| Nearby towns and cities | 108 km (67 mi) W of Shimokizukuri (Tsugaru) (pop: 18,900) | Show on map | Quakes nearby 113 km (70 mi) W of Goshogawara (pop: 49,100) | Show on map | Quakes nearby 117 km (73 mi) NW of Noshiro (pop: 51,100) | Show on map | Quakes nearby 123 km (76 mi) WNW of Hirosaki (pop: 175,000) | Show on map | Quakes nearby 137 km (85 mi) W of Aomori (pop: 298,400) | Show on map | Quakes nearby 146 km (91 mi) NW of Ōdate (pop: 64,500) | Show on map | Quakes nearby 160 km (99 mi) WSW of Hakodate (pop: 275,700) | Show on map | Quakes nearby 166 km (103 mi) NNW of Akita (pop: 320,100) | Show on map | Quakes nearby 294 km (183 mi) SW of Sapporo (pop: 1,883,000) | Show on map | Quakes nearby 593 km (369 mi) N of Tokyo (pop: 8,336,600) | Show on map | Quakes nearby |
| Estimated seismic energy released | 7.9 x 1012 joules (2.21 gigawatt hours, equivalent to 1898 tons of TNT or 0.1 atomic bombs!) | about seismic energy |
Data for the same earthquake reported by different agencies
Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
| Mag. | Depth | Location | Source |
| 5.4 | 18 km | Hokkaido, Japan region | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Aftershocks
[More info]
Recorded aftershocks, latest first (4 quakes)
Date and time | Mag Depth | Location | Details |
| Jul 24, 1983 19:07 39 years ago | 4.3 33 km | 125 km W of Hirosaki, Aomori, Japan | More |
| Jun 30, 1983 04:33 39 years ago | 4.6 33 km | 99 km W of Shimokizukuri, Tsugaru Shi, Aomori, Japan | More |
| Jun 22, 1983 04:36 39 years ago | 5.0 15 km | 124 km NW of Hirosaki, Aomori, Japan | More |
| Jun 22, 1983 00:59 39 years ago | 4.5 33 km | 90 km NW of Noshiro, Akita, Japan | More |
Earlier earthquakes in the same area
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